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Table 1 Baseline characteristics of the total group of UA patients and the subgroups of patients with UA according to the 1987 and the 2010 criteria

From: Does information on novel identified autoantibodies contribute to predicting the progression from undifferentiated arthritis to rheumatoid arthritis: a study on anti-CarP antibodies as an example

  Total group of UA patients Subgroup of 1987 UA patients Subgroup of 2010 UA patients
(n = 1430) (n = 1352) (n = 838)
Age (years), mean (SD) 53 (17) 53 (17) 51 (17)
Female, n (%) 882 (62) 837 (62) 494 (59)
Symptom duration (weeks), median (IQR) 14 (6-31) 14 (6-31) 12 (5-28)
66-SJC, median (IQR) 3 (1-7) 3 (1-7) 2 (1-4)
68-TJC, median (IQR) 4 (1-10) 4 (1-10) 2 (1-5)
CRP (mg/ml), median (IQR) 8 (3-22) 8 (3-22) 6 (3-19)
ACPA positivity, n (%) 297 (21) 283 (21) 48 (6)
RF positivity, n (%) 374 (26) 359 (27) 68 (8)
anti-CarP positivity, n (%) 271 (19) 257 (19) 77 (9)
  1. Of the total group of UA patients (n = 1430), 760 patients have UA both according to the 1987 and 2010 criteria, 592 patients only have UA according to the 1987 criteria, and 78 patients only have UA according to the 2010 criteria
  2. ACPA, anticitrullinated protein antibodies; anti-CarP, anticarbamylated protein antibodies; CRP, C-reactive protein; IQR, interquartile range; RF, rheumatoid factor; SD, standard deviation; SJC, swollen joint count; TJC, tender joint count; UA, undifferentiated arthritis; symptom duration, time between symptom onset and inclusion in cohort